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《GEOCHIMICA》 1995-03
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EXPERIMENTAL STUDY ON SOLUBILITY OF Cr ̄(2+) IN OLIVINE,ORTHOPYROXENE AND SPINEL SOLID SOLUTION

Li Jianping; Hugh St. C. O′Neill; Friedrich Seifert(Guangzhou Institute of Geochemistry, The Chinese Academy of Sciences,Guangzhou 510640)(Bayerisches Geoinstitut, Univeritat Bayreuth, D-95440 Bayreuth, Germany)  
Experiments were performed in the MgO-SiO2-Cr-O system at 0─2.88 GPa and 1100─1450℃,with interests focusing on the solubility of Cr2+ in olivine(Ol), orthopyroxene (Opx) and spinel (Sp) and its partitioning between these phases. Analytical reagent grade chemicals, MgO, SiO2,Cr2O3 and Cr were used to make starting mixes. Cr and Cr2O3 were mixed at stoichiometric ratio to yield the composition CrO.Excess Cr (50%) was then added to these mixtures to ensure that the resulted phases were in equilibrium with metal Cr. Flux of BaO + B2O3 (10%) was added to facilitate experimental equilibrium and growth of crystals. Metal Cr was used as the capsule material. All phases in the product were identified by X-ray and analyzed by electron microprobe. The CrO content (%) in the different phases (Ol,Opx and Sp) was calculated according to stoichiometry. The results indicate that Cr3+ in Ol and Opx is negligible, and that the solubility of Cr2+ in Ol, Opx and SP increases with increasing temperature and decreasing pressure. lnKd(Mg-Cr2+)(Ol-OPX) decreases,and lnKd(Mg-Cr2+)(Opx-Sp), increases with increasing temperature, while lnKd(Mg-Cr2+)(Ol-Sp) doesn't change much. The effect of pressure on all partitioning coefficients is negligible.
【CateGory Index】: P589
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1 Yi Facheng (Southwest Institute of Technology, Mianyang 621002)Gao Zhenmin (The Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002);THE GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF PLATINUM-GROUP ELEMENT IN BLACK ROCK SERIES[J];ADVENCE IN EARTH SCIENCES;1996-03
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1 Zheng Dazhong,Zheng Ruofeng;Investigation on gold′s migrational form of the gold deposits located in middle and lower reaches of Changjiang River[J];GOLD;1998-09
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